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Evolution of temperature of a droplet of liquid composite fuel interacting with heated airflow

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Thermophysics and Aeromechanics Aims and scope

Abstract

The macroscopic patterns of a temperature change at the center of a droplet of three-component (coal, water, petroleum) composite liquid fuel (CLF) were studied using a low-inertia thermoelectric converter and system of high-speed (up to 105 frames per second) video recording during the induction period at different heating intensity by the air flow with variable parameters: temperature of 670−870 K and motion velocity of 1−4 m/s. The studies were carried out for two groups of CLF compositions: fuel based on brown coal and coal cleaning rejects (filter cake). To assess the effect of liquid combustible component of CLF on characteristics of the ignition process, the corresponding composition of two-component coal-water fuel (CWF) was studied. The stages of inert heating of CLF and CWF droplets with characteristic size corresponding to radius of 0.75−1.5 mm, evaporation of moisture and liquid oil (for CLF), thermal decomposition of the organic part of coal, gas mixture ignition, and carbon burnout were identified. Regularities of changes in the temperature of CLF and CWF droplets at each of identified stages were identified for the cooccurrence of phase transitions and chemical reactions. Comparative analysis of the times of ignition delay and complete combustion of the droplets of examined fuel compositions was performed with varying droplet dimensions, temperatures, and oxidant flow velocity.

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Authors and Affiliations

  1. National Research Tomsk Polytechnic University, Tomsk, Russia

    D. O. Glushkov, A. V. Zakharevich, P. A. Strizhak & S. V. Syrodoy

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  1. D. O. Glushkov
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  2. A. V. Zakharevich
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  3. P. A. Strizhak
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  4. S. V. Syrodoy
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Corresponding author

Correspondence to P. A. Strizhak.

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The study was financially supported by the Russian Science Foundation (Project No. 15–19–10003).

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Glushkov, D.O., Zakharevich, A.V., Strizhak, P.A. et al. Evolution of temperature of a droplet of liquid composite fuel interacting with heated airflow. Thermophys. Aeromech. 23, 887–898 (2016). https://doi.org/10.1134/S0869864316060111

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  • DOI: https://doi.org/10.1134/S0869864316060111

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